Dandelion-shaped TiO2/multi-layer graphene composed of TiO2(B) fibrils and anatase TiO2 pappi utilizing triphase boundaries for lithium storage
Dandelion-shaped TiO2/multi-layer graphene composed of TiO2(B) fibrils and anatase TiO2 pappi utilizing triphase boundaries for lithium storage
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DOI：
10.1039/c6ta02548j
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发表时间：
2016-05
影响因子：
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通讯作者：
Weixin Song;Jun Chen;Xiaobo Ji;Xuemei Zhang;F. Xie;D. Riley
中科院分区：
文献类型：
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作者：
Weixin Song;Jun Chen;Xiaobo Ji;Xuemei Zhang;F. Xie;D. Riley
合成了一种由TiO2(B)原纤维和锐钛矿脑浆结构组成的三维蒲公英形TiO2/多层石墨烯化合物（TiO2/MLG），作为锂存储的潜在负极材料。电镜观察表明，复合材料中含有锐钛矿、TiO2(B)和石墨烯的三相界面，这是增强储能和降低电极极化的原因。循环伏安研究表明，Li+插入和赝电容都有助于电荷存储。在0.1和1 μ g−1下分别获得了243和182 mA h g−1的超高比容量。此外，在0.1 A g−1下，经过100次循环后，容量保持率达到99.6%，库仑效率接近100%。证明了三相边界对增强锂离子的电荷储存和输运的重要性。
A three-dimensional dandelion-shaped TiO2/multi-layer graphene compound (TiO2/MLG) composed of TiO2(B) fibrils and anatase pappus structures has been synthesized as a potential anode material for Li storage. Electron microscopy indicates that the composite contains triphase boundaries between anatase, TiO2(B) and graphene, which are responsible for the enhancement of energy storage and the decrease of electrode polarization. Cyclic voltammetric investigations indicate that both Li+ insertion and pseudocapacitance contribute to charge storage. Ultrahigh specific capacities of 243 and 182 mA h g−1 have been obtained at 0.1 and 1 A g−1, respectively. Moreover, the excellent capacity retention can reach 99.6% after 100 cycles with almost 100% coulombic efficiency at 0.1 A g−1. The importance of the triphase boundary in enhancing the storage of charge and transport of Li+ is demonstrated.